added grammar files

src/ast/operators.rs

@@ -0,0 +1,30 @@
+use crate::ast::expression::Expression;
+
+pub enum Operator {
+    Unary(UnaryOperator),
+    Binary(BinaryOperator),
+}
+
+pub enum UnaryOperator {
+    Minus,
+    Not,
+    Reference,
+    Dereference,
+}
+
+pub enum BinaryOperator {
+    Plus,
+    Minus,
+    Multiply,
+    Divide,
+    Modulo,
+    And,
+    Or,
+    Xor,
+    Equal,
+    NotEqual,
+    Greater,
+    GreaterEqual,
+    Less,
+    LessEqual,
+}